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(CT/P-09) Pellet Injection as a Possible Tool for Plasma Performance Improvement

A.R. Polevoi¹⁾, M. Sugihara¹⁾, H. Takenaga²⁾, A. Isayama²⁾, N. Oyama²⁾, A. Loarte³⁾, G. Saibene³⁾, G.V. Pereverzev^4)
 
1) ITER IT, ITER Naka JWS, Naka-Machi, Naka-Gun, Ibaraki, Japan ²⁾ Japan Atomic Energy Research Institute, Naka Establishment, Mukouyama, Naka-machi, Naka-gun, Ibaraki-ken, Japan
³⁾ EFDA, Max-Plank-Institut fur Plasmaphysik, Garching bei München, Germany

Abstract.  The possibility of plasma performance improvement in the ITER reference 15 MA scenario by pellet injection is considered. Fusion gain Q increasing by density peaking and controllable mitigation of the energy loss in the Type-I Edge Localised Modes (ELMs) by increase of the pedestal collisionality are analysed. Plasma scenario with Q = 20 within the Greenwald density limit is demonstrated. Requirements for pellet injection for the ELM loss reduction below 5% of the pedestal energy is considered.

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